Artforum is an international monthly magazine specializing in contemporary art. The magazine is distinguished from other magazines by its unique 10½ × 10½ inch square format, with each cover often devoted to the work of an artist. Notably, the Artforum logo is a bold and condensed iteration of the Akzidenz-Grotesk font, a feat for an American publication to have considering how challenging it was to obtain fonts favored by the Swiss school via local European foundries in the 1960s. Artforum is published by Artforum Media, LLC, a subsidiary of Penske Media Corporation.

John P. Irwin, Jr named the magazine after the ancient Roman word forum hoping to capture the similarity of the Roman marketplace to the art world's lively engagement with public debate and commercial exchange. The magazine features in-depth articles and reviews of contemporary art, as well as book reviews, columns on cinema and popular culture, personal essays, commissioned artworks and essays, and numerous full-page advertisements from prominent galleries around the world.

Artforum was founded in San Francisco in 1962 by John P. Irwin, Jr. Irwin was a salesman for Pisani Printing Company and would make frequent stops to the galleries around Brannan Street and the Financial District for deliveries. Gallery curators and artists, like Philip Leider, suggested to Irwin that he should start a local arts publication that catered to the West Coast arts scene since they were tired of reading about the same New York-based artists in Art in America, Arts Magazine, and Art News. Through the backing of Pisani Printing Company, Irwin successfully launched the magazine in a small office off of Howard Street. The first issue featured a cover with a work by the kinetic sculpture by Swiss painter Jean Tinguely suggesting the inchoate and indistinct identity of the fledgling publication. "That center section will contain a lot of divergent and contradictory opinion[s]," reads an editorial note in the first issue.

The next publisher/owner Charles Cowles moved the magazine to Los Angeles in 1965 before finally settling it in New York City in 1967, where it maintains offices today. The move to New York also encompassed a shift in the style of work championed by the magazine, moving away from California style art to late modernism, then the leading style of art in New York City. One of Leider's final essays for the magazine, "How I Spent My Summer Vacation, or, Art and Politics in Nevada, Berkeley, San Francisco and Utah," is a reflective first-person account of a cross-country road trip visiting earthworks, such as Michael Heizer's Double Negative (1969) and Robert Smithson's Spiral Jetty (1970). The essay grapples with the relationship between politics and art.

The departure of Philip Leider as editor-in-chief in 1971 and the tenure of John Coplans as the new editor-in-chief roughly coincided with a shift towards more fashionable trends and away from late modernism. A focus on minimal art, conceptual art, body art, land art and performance art provided a platform for artists such as Robert Smithson, Donald Judd, Sol LeWitt and others. In 1980, after opening his own gallery in New York City, Charles Cowles divested himself of the magazine. A sister magazine, Bookforum, was started in 1994.

In 2003, the Columbia-Bard graduate Tim Griffin became the editor-in-chief of the magazine. He sought to bring back a serious-tone and invited academics and cultural theorists who were mostly suspicious of art and the market. The writers were mostly European male theorists like Slavoj Zizek, Giorgio Agamben, Alain Badiou, Toni Negri, and Jacques Rancière. The magazine shed light on a new emergence of digital neo-appropriation artists such as Wade Guyton, Seth Price, and Kelley Walker and eventually featured a cover by artist Danh Vō.

Michelle Kuo, a PhD candidate at Harvard and respected critic, was announced as the editor-in-chief in 2010 after Tim Griffin resigned to pursue other work. The magazine followed a similar, sober tone of under its new leadership with round-table discussions, book and exhibition reviews, and lively hyper-academic discourse. In October 2017, publisher Knight Landesman resigned in the wake of allegations of sexual misconduct with nine women including a former employee who filed a lawsuit. Artforum initially backed Landesman, saying the allegations were "unfounded" and suggested that lawsuit was "an attempt to exploit a relationship that she herself worked hard to create and maintain." The magazine's editor Michelle Kuo resigned at the end of the year in response to the publishers' handling of the allegations. Kuo released a statement in Artnews noting, "We need to make the art world a more equitable, just, and safe place for women at all levels. And that can only be achieved when organizations and communities are bound by shared trust, honesty, and accountability." Artforum staff released a statement condemning the way the publishers had handled the allegations.

A new era of Artforum emerged under the leadership of David Velasco in January 2018. In his first issue, featuring a self-portrait by the born HIV-positive artist Kia LaBeija, Velasco wrote a poignant statement: "The art world is misogynist. Art history is misogynist. Also racist, classist, transphobic, ableist, homophobic. I will not accept this. Intersectional feminism is an ethics near and dear to so many on our staff. Our writers too. This is where we stand. There's so much to be done. Now, we get to work." Art critic Jerry Saltz immediately praised the new direction the magazine had taken, noting, "And just like that, an Artforum that needed to disappear was gone." The new editorial direction included writing and photographic essays by Molly Nesbit, philosopher and curator Paul B. Preciado, critic Johanna Fatemen, and artists such as Donald Moffet.